diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 02fdcba..a0df45d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -41,3 +41,5 @@ jobs:
           zig build test -Dall --summary all
           zig build run -- test/first/main.nat
           nat/first
+          zig build run -- test/stack/main.nat
+          nat/stack